KeepAliveInterval Property (FtpClient)

Gets or sets the interval, in seconds, at which a NOOP command is sent on the command channel during a file transfer.

Syntax

Visual Basic
C#

'Declaration
 
Public Property KeepAliveInterval As Integer

'Usage
 
Dim instance As FtpClient

Dim value As Integer

 

instance.KeepAliveInterval = value

 

value = instance.KeepAliveInterval

public int KeepAliveInterval {get; set;}

Property Value

A value, in seconds, representing the interval at which a NOOP command will be sent on the command channel during transfer. By default, 0 seconds, indicating that no NOOP command should be sent.

Remarks

This property currently only applies to file transfers. Setting this property can be useful to prevent routers from prematurely closing the command channel while a long data transfer is taking place. It is generally not necessary to set a value less than 15 minutes (900 seconds).

Not all FTP servers support receiving NOOP commands during file transfers.

It's been observed that these servers will act strangely, not reply to the command, or only send the reply after the file transfer has completed. This will cause the component to throw a timeout exception since it's expecting a reply within the timeout period.

If you see this behavior, consider not using this property

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

FtpClient Class
FtpClient Members